Toy clam shell dredge



Jan. 4, 1955 J. A. BARNHART TOY CLAM SHELL DREDGE 2 Sheets-Sheet 1 I Filed Sept. 3, 1953 R O T E V N I .hhzAJam/iarl ATTDENEYS Jan. 4, 1955 J. A. BARNHART TOY CLAM SHELL DREDGE 2 Sheets-Sheet 2 Filed Sept. 3, 1953 INVENTOR.

ATTORNEYS United States Patent TOY CLAM SHELL DREDGE John A. Barnhart, La Porte, Ind.

Application September 3, 1953, Serial No. 378,341

1 Claim. (Cl. 212-44) This invention relates to winches or cable control and operating drums particularly as used for actuating clam shell buckets and hoists, and in particular operating instrumentalities including a pair of drums mounted on a common shaft with one of the drums fixed to the shaft and actuated by a crank extended from one end of the shaft and with the other drum which is freely mounted on the shaft, frictionally retained in a stationary position with a spring finger and rotated after one complete revolution of the drum fixedly mounted on the shaft by engagement of a lug extended from the fixedly mounted drum with a lug extended from the freely mounted drum, and in order to prevent fouling of cables from the drums the device is provided with a latch for preventing rotation of the drums as soon as slack develops in one of the cables.

The purpose of this invention is to provide means for operating a clam shell bucket depending from the end of a boom whereby a crank on the end of a shaft is rotated through one revolution of the shaft with the bucket in an upper position at the end of the boom to close the jaws of the bucket, and wherein with continued movement of the crank in the same direction the bucket is lowered until it strikes material to be picked up thereby, at which time the crank is rotated through one revolution in the opposite direction, which closes the jaws of the bucket, and with continued movement of the crank in the same direction the bucket is elevated, with the jaws closed, to a position at the upper end of the boom.

In the conventional manner of operating clam shell buckets for this use drums are provided on a plurality of shafts with the shafts actuated by gears and clutches whereby one shaft is held while the other is rotated and by this means the jaws of a bucket and also the bucket may be actuated. For use in toy machinery of this type a this is too costly and with this thought in mind this invention contemplates means for operating and holding cables to obtain different movements in machinery and equipment suspended by the cables wherein parts, such as a clam shell bucket may be opened and closed and raised and lowered with a common crank.

The object of this invention is, therefore, to provide means for holding a drum from which a hoisting cable extends while another cable is actuated to open and close a bucket suspended by the hoisting cable.

Another object of the invention is to provide a toy clam shell hoist having a latch for automatically holding the drum to prevent fouling of the cables.

A further object of the invention is to provide a clam shell bucket operating hoist adapted to be used as a toy in which the device is of a simple and economical construction.

With these and other objects and advantages in view the invention embodies a boom pivotally mounted on a rotatable platform of a chassis provided with wheels with a clam shell bucket suspended and actuated by cables extended from the bucket over sheaves in the end of the boom to drums in a cab on a rotatable platform, with a hoisting cable extended from a drum freely mounted on a shaft, a bucket opening and closing cable extended from a drum fixedly mounted on the same shaft, and with a boom raising and lowering cable extended to a second shaft in the cab.

Other features and advantages of the invention will appear from the following description taken in connection with the drawings, wherein:

2,698,691 Patented Jan. 4, 1955 Figure 1 is a side elevational view showing a clam shell bucket suspended from a boom of a hoist device with the bucket shown in the closed position in full lines and in an open position in broken lines.

Figure 2 is a sectional plan through the cab of the hoist with the parts shown on an enlarged scale, taken on line 22 of Figure 1, illustrating the general arrangement of the drums, latch, and a spring finger which retains the freely mounted drum in an inoperative position during opening and closing movements of the bucket.

Figure 3 is a longitudinal section through the cab taken on line 33 of the Figure 2.

Figure 4 is a longitudinal section through the outer end of the boom with the parts shown on an enlarged scale and showing the bucket in the open position.

Figure 5 is a vertical section through the boom and bucket being taken on line 55 of Figure 4.

Figure 6 is a detail showing a section taken substantially on line 33 of Figure 2 illustrating a latch for holding the drum fixedly mounted on the shaft when slack deg/flops in the hoisting cable to prevent fouling of the ca es.

Figure 7 is a longitudinal section through the cab taken substantially on the center of the shaft for raising and lowering the boom.

Figure 8 is an exploded view illustrating the fixedly mounted and freely mounted drums which are adapted to receive the bucket opening and closing cable and hoisting cable, respectively.

Figure 9 is a perspective View of the holding lever.

Referring now to the drawings wherein like reference characters denote corresponding parts the hoist device of this invention includes a shaft 10 having a crank 11 extended from one end with a drum 12 for a bucket opening and closing cable 13 fixedly mounted on the shaft, and a drum 14 for a hoisting cable 15 freely mounted on the shaft, the cables 13 and 15 extending to a pulley block 16 of a clam shell bucket having jaws 17 and 18, and the shaft 10 is mounted in a cab 19, in which a shaft 20 with a crank 21 on one end for raising and lowering a boom 22 with a cable 23, is also mounted.

The shaft 10 is journaled in bearings 24 and 25 of end plates 26 and 27, respectively of a frame having a base 28 and, as illustrated in Figure 2, the drum 12, which is provided with flanges 29 and 30 is secured to the shaft 10 with a set screw 31 that is positioned in a hub 32 on one end of the drum.

The drum 14 is provided with similar flanges, as indicated by the numerals 33 and 34 and this drum is provided with a hub 35, at one end and a hub 36 at the other. The hub 36 is positioned to be engaged by a spring finger 37 that is secured on the floor 38 of the cab with screws 39.

The spring finger 37 holds the drum 14 in a stationary position to retain the bucket in an upper position as jaws thereof are opened and closed and, also holds the bucket in a stationary position as the jaws of the bucket are closed with the bucket in the lower position as indicated by the broken lines in Figure 1.

The flange 30 of the drum 12 is provided with a lug 40 and, as shown in Figures 2 and 8 a similar lug 41 extends from the flange 33 of the drum 14 whereby the lug of the drum 12 is positioned to engage the lug of the drum 14.

With the lugs 40 and 41 of the drums 12 and 14, respectively, positioned in this manner the drum 12, which is fixedly mounted on the shaft 10 is rotated by the crank 11 through a complete revolution, in a clockwise direction, looking toward the end of the cab on which the crank 11 is positioned whereby the cable 13 draws a sheave 42, as shown in Figure 4, upwardly to close the jaws and, after the jaws are closed the lug 40 picks up the lug 41 and rotates the drum 14 in the same direction whereby the cable 15 is actuated to draw the bucket upwardly, the jaws being held closed by the cable 13 which continues to be operated in this movement.

When the bucket has traveled upwardly until the block 16 engages the lower side of the boom, the crank 11 is rotated in a counter-clockwise direction wherein, with the spring finger 37 holding the drum 14 the drum 12 unwinds the cable 13 permitting the sheave 42 to drop downwardly by gravity to the position shown in Figure 4 whereby the jaws are opened. As soon as the bucket is opened the lug 40 again picks up the lug 41 causing the drum 14 to rotate to unwind the cable 15 whereby the bucket drops downwardly by gravity to the position shown in broken lines in Figure 1. With the bucket in this position it is adapted to scoop up material and, repeating the cycle, the drum 12 is rotated by the handle or crank 11 with the spring finger 37 holding the drum 14 in a stationary position until the jaws of the bucket are closed by upward movement of the sheave 42, and at this time the lug 40 again picks up the lug 41, rotating the drum 14 to wind the hoisting cable 15 therein.

The flange 30 of the drum 12 is provided with a notch 43 that is positioned to receive an end 44 of a lever 45, as shown in Figures 6 and 9 to prevent free rotation of the drums to permit fouling of the cables should slack develop therein.

The lever 45 is pivotally mounted with a pin 46 in a bearing 47 and the end opposite to the end in engagement with the flange 30 or extended into the notch 43 is provided with an arm 48 that extends for engagement with the cable 15, as shown in Figure 2 whereby with tension on the cable 15, such as that resulting from the weight of a bucket suspended by the cable the latch will be retained in the position shown in Figure 3, whereas should slack develop in the cable the arm 48 would drop with the weight of the arm moving the end 44 upwardly into engagement with the notch 43, as shown in Figure 6. By this means the latch is inoperative or retained in a position out of engagement with the flange 30 as long as there is tension in the cable 15, however, upon the bucket striking an obstruction, whereby with continued rotation of the shaft 10 slack develops in the cable, the latch is instantly released and the end 44 moves upwardly into the f notch 43.

The bucket opening and closing cable 13 extends from the drum 12 through an end wall 48 of the cab 19 and upwardly through the boom 22 to a sheave 49 which is mounted on a pin 50 and from the sheave 49 the cable 13 passes downwardly through an eye 51 on the side of the block 16 and around the sheave 42 from which it is returned to an eye 52 extended downwardly from the block 16.

The cable 15 which extends from the drum 14 also extends upwardly through the boom 22 and at the upper end of the boom, the cable 15 is trained over a sheave 53 on a pin 54. From the sheave the cable passes downwardly to an eye 55 on the upper end of block 16.

The sheave 42 is journaled by a pin 56 in bearings 57 and 58 which extend upwardly from a head 59 on the lower part of which the jaws 17 and 18 of the bucket are pivotally mounted with pins 60 and 61. The outer ends of the jaws 17 and 18 are connected by rods 62 and 63 to the block 16 whereby, with the outer ends of the jaws fixedly mounted in relation to the block 16 the inner edges are drawn together as the head 59 is drawn upwardly by the cable 13.

The cable 23 by which the boom 22 is raised and lowered is secured, at one end, to an eye 64 in the cabin 19 and from the eye the cable extends upwardly through an opening 65 from which the cable extends around a sheave 66 in a pulley block 67 that is secured to the upper end of the boom with a cable 68 and a fastener 69, and from the sheave 66 the cable 23 extends over a pulley 70 to the shaft 20 on which the crank 21 is provided. In the free position, the shaft 20 is urged by a spring 71, which acts against a set collar 72, toward the opposite side of the cab where a toothed wheel 73 secured to the shaft with a set screw 74 in a hub 75 thereof, meshes with an angle bar 76 on a side wall 77 of the ca With the parts assembled in this manner the shaft 20 is pressed inwardly by the crank 21 when it is desired to actuate the boom whereby the shaft is adapted to be rotated to wind the cable 23 thereon or to release the cable therefrom, to adjust the position of the boom, and when the boom is in the desired position the crank is released whereby the spring 71 moves the toothed wheel 73 into engagement with the angle bar 76 so that the shaft is retained in a stationary position.

The boom 22 is pivotally mounted on the platform 78 of the cab 19 with a shaft 79 which is journaled in bearings 80. The platform and cab are rotatably mounted on the frame or chassis 81 of the hoist with a king pin 82 that extends through a bearing 83 on the platform 78 and through the upper end of the frame 81 with the lower end being secured with a lock nut 84 and a washer 85. The upper end of the pin 82 is secured in a bearing 86 and a spacing washer 87 is provided between the cab and frame. The frame or chassis 81 is mounted on wheels 88 with shafts 89 in depending bearings or hangers 90.

It will be understood that the hoist may be mounted on a platform or floor of a truck, tractor, or other suitable device.

It will be understood that other modifications, within the scope of the appended claim, may be made in the design and arrangement of the parts without departing from the spirit of the invention.

What is claimed is:

In a toy clam-shell bucket hoist, the combination which comprises a chassis mounted on wheels, a platform having a cab thereon rotatably mounted on the chassis, a boom pivotally mounted on the platform, means for raising and lowering the extended end of the boom, a shaft journaled in the cab and having a crank extended from one end, an opening and closing drum fixedly mounted on said shaft, a hoisting drum freely mounted on said shaft, a spring finger mounted in the cab and positioned to frictionally hold the freely mounted drum, the inner ends of said drums being positioned in spaced relation and each of said drums having a lug extended therefrom with the lug of one drum positioned to engage the lug of the other drum, said lugs being positioned whereby upon completion of one revolution of the bucket opening and closing drum the lug thereof picks up the lug of the hoisting drum to actuate the hoisting drum, a bucket having pivotally connected jaws depending from the extended end of the boom, a cable extended from the hoisting drum through the boom to the bucket, another cable also attached to the bucket and trained over a sheave pivotally connected to the jaws of the bucket for opening and closing the jaws and said cable passing from the sheave through the boom to the opening and closing drum fixedly mounted on the shaft in the cab, said opening and closing drum having flanges on the ends on one of which the lug thereof is positioned and one of said flanges having a notch therein, and a latch pivotally mounted in the cab and positioned with one end adapted to engage the notch in the flange of the opening and closing drum and the opposite end positioned to be engaged by the cable of the hoisting drum whereby with the cable of the hoisting drum taut the latch is retained out of engagement with the notch and with the cable slack the latch is moved into the notch to prevent rotation of the drums.

No references cited. 

